Bending machine



J. H. HQLMGREEN BENDING MACHINE Filed Aug. 4, 1919 4 Sheets-Sheet 1ATTORNEYS.

NVENTOR. Holmg reen Aug. 21, 1923. 1,465.733

J. H. HOLMGREEN BENDING MACHINE Filed Aug. 4, 1919 4 Sheets-Sheet 2 R II INVENTOR.

Julius Hfiolmgreen ATTORNEY],

J. H. HOLMGREEN BENDING MACHINE Filed Aug 4 Aug. 21, 1923.

NH WEI Til Q TE! INVENTOR 'JuliusHHolmqreen ATTORNEYJ,

.Aug.21,1923. 1,465,733

J. H. HOLMGREEN BENDING MACHINE Filed Au 4, 1919 4 sheets-sheaf 4INVENTOR.

Julius HHolmgreen B Y Wfizm M ATTORNEYS,

Patented Aug. 21, 1923.]

JULIUS H. HQLMGREE 0e SAN Anromo, Texas.

BEND'ING MACHINE.

Application filed August 4, .1919. Serial No. 315,154.

bend rods. bars. wires and similar materials into a variety of formssuitable for structural purposes, such as reinforcements for concretestructures Machines of this kind previously used were hand operatedandthe degree of bending was usually gagedonly bftheeye with perhaps theaid ofa chalk mark on the machine. As a resultthe different pieces,supposedly of the same were not bent tothe same angle thus intro ducinginaccuracies in the set-up reinforcing structure. Only a limited numberof bends could be made. the accuracyof which largely depended ontheskill of the operator in stopping the machine when the bar wjas bent.

around to a chalk mark on the work table. By this invent-ionl obviateall the disadvantages of prior machines and it is a-u'iong the objectsof my invention to produce a machine which is semi-automatic in;its'operation, bends pieces to accurate shapes. is comparatively simple,easily operated and very rapid in bending various materials.

In carrying the objects of into effect I provide an index means or stopmemberpreferably on the shaft of the machine and in the specificembodiment described, in the form of a disk having holes therein which Icall an index plate. By means of this member I am enabled to stop themachine after a predetermined angle has been formed on the materialbeing bent. I am able to bend not only sharp angles but Us, Vs and Ss,closed and open loops, com

binations of these, reverse curves and the various other shapes intowhlch rods, bars, etc.. are capable of being bent.

Specifically, my machine comprises a' frame and a shaft preferablyvertically mounted therein, 'a turn table fixed to the upper end of theshaft and meansfor hold ing and bending the material. Any suitabledriving means may be employed but pref erably I use a worm wheel andworm, my index plate being preferably attached to the my invention lowerend'of the shaft below the worm wheel.

Referring to the accompanying drawings forming a part thereof, which isillustrated a specific embodiment of my invenacters denote similarparts,

"Figure 1., illustrates a fron machine,

Figure 2, a plan view being omitted, I v p Eigure 3', a verticalsection, being in elevation and some omitted,

thereof, some parts Figure 4, a section on line 4" i of Fig ;ure'3, r V1 F gures 5, 6 and? showmodifications of the bending pin, H

Figure 8, a modified form 10f indezi plate," Figure 9, differentindexnieans, and Figures 10, 11, 12 and 13 various bends which are made by mymachine. I

The machine A comprises a frame work consisting of upper and lowersections 1;

at line 3*by bolts. The machine rests on. a

pulleys (or gears) lland having its ends journa'l fed to the'base l atl2. f Clutches 13 and shift bars 14: having 001- lars, 15 engaging theclutches are provided.-

some 'partsso tion, and in which similar referenceobart view my 7.

and 2, respectively, preferably of tlie same' f'shape in orderv that thesame 'mold may be 8" used in casting them, which are connected base 4andicarries at its upper end a work table 5. A shaft 6 preferablyverticalis A shift, bar 16 is fixed near the endsl'T of bars 14 so thatwhen one clutch is thrown in the other is thrown out. A shifting bar '19V is slidab'ly attached tot-he frame 4 by bars 20 and has. a pivot 21thereon to'which is attached bar 22 journaled in the frame of themachine at 23 and pivotally attached to bar 16 at 24 inorder that ashifting of bar 19 may cause a corresponding shifting of'bar 16 and theclutches. 1

Fixed'to: the shaft and p'referably to the lower end thereof is an indexplate 25' whose hub 26 engages the shaftfi, and having-in its peripheralportion 27 a seriesof holes 28 'which' are adapted to engage 'stop pins2 9 V edjnstment purposes.

normally holds the pedal or in tinted 56 and 57.

formed on bar 19 and some of these pins have retracting springs 32thereon 'to normally hold the end 31 so as to avoid contact with thestop 33. Pivot-2d to the frame at 36 is a lever the end 3? of which is:ulapted to be pressed down by the foot, and retracting spring retractedposition. A plate 39 ha ing upwardly curred ends 40 is atlaehed 'io anintermediate portion and is adapted to engage one of the retracted pinsto press the shine downwardly To the upperend o'f snalt 6 i's hxed atorn table j. which may extend to the surface of the Work table '5, butpre'l'erzil'ily hes bolted to it u plat-e ill by means or" countersunkbolts all, Upon the turntable is fixed a cramping member 48 held inplace by bolt Bending: pin '50 which may be any. suitable shape isinserted into a corresponding hole in the renter 0'? plate and car- 7ries a keyivay and key 51 adapted to lie 5.

pin against rotatory motion relative to rtion of the same SUZG and shapeas 52 in order to provide a meansior allowing' 3 m '0 to sl p down intoits hole after which disk-53 is rotateil so as to lock the pin againstyetieal moyernent f Various shapes and sit res of bending pins may beused such as are illus Wheh it is desired to form bends of large radiuscollars 58 of onions sizes may he slipped over pin to provide a bearingsurfacelor the n aterial to be bentrto the, desired curvature.

On the Work tableare formed eseries of grooves 60 fire'lerably T hapedwhich are adapted to engage bolts for h lding); an adjustable stopmember to the vork table, The stop member consists preferably of amemoer 61 which may be aiiljustably secured in said slots and carries amovable frame 62 'heldin alignment and in position by bolts 33 and (34;,lhe bolt G l ope at n; inn slot 65 "for On the end 66 oi the stopiournaled a roller 6? preferably in a hole drilled in. the end of: themember 66 into which the roller is inserted. Plates 68 prevent roller 67from moving vertically upward or downward. V The operation of themachine is as follows:

' The cramping member 48,. bencling pin 50 and stop member 61 are fixedin the positions shownso that rod or other material to be bent may beplaced between them. The index plate 25 carries apermanent stop B, and,for example, another stop 29 at an angle (r5135 degrees'to thefirststop.-The lever-1T ispushed over, let us sayto the left, as shown by thearrow in order to The stop member 29 which moves with the index plate 25will engage oro ieetion 3 on Meanwhile the cramping; member 48hasengagerl the end of the roll to be bent and has bent it around pm 5 hthe free end or:

the rod being in engagement wii'ih'roller 6 V which holds in aliginnent.When erznnpingnimnber l8 engages the end (it the rod ljieingf bent itcauses a creeping motion of the rod so that the rod moves slowly for-Ward so as to allow "of lree bending; without any binding or unduestrain on the machine. 7 V V preferably provide a series of gage members7(h 71; etc, adjnstuhly mounted noon ubar "Z2 fixed to the frame of themachine. #Vhen rodto be bent is placed on lhe table, gage member as 70,which is normally in a raised positiomis thrown over about its pin 73 toallow the gage to lie in a horizontal. position and engage theend of therod being bent,

After the first bend of 135 degrees, for exznnple hasbeen madeand it isdesired to make another bend on the same rod, let us say at an angle oi90 degrees a retracting p n 3 set at an angle ot 90 degrees to thepermanent stop member is placed the;

index platel- "he' first bend hm 11153 been ioo made; the rod removed ad the machine l inanentstop member B ring-t res pro} 233. stopping. themachine as; the original point. V

The rod being bent is-agaln inserted between the stop members with itsend abutting the, next nag'o member U, which has been thrown down into:1 horizontal nositionf The member l? is again i'hrowh to the le'i't tostart the i'i'inchi'e and the pedal 37 depressed so that it engagest'hehead of the retracting: pin El i pressin g'it down \\'ar( y as itapproaches firoieetion 33 cansing it to shift bar l5) again rut-ting outthe driving means and strr riping the machine when the desired Ru le of90 degrees has been formed. 3 r 7 It will beseen that by thisarrangement I may 'iornitrro bends oi different angles on a bar Withoutresettingthe machine. I can form. more than two bends of dilferentcharacter Without resetting my machine by providing a plurality ofretractingpins of dif .le'rent lengths operated byeither a plurality 5spring retracted pedals or by a single initl the g' eiy Jill ' and rtightening the screw.

pedal which is adapted to assume a plurality of vertical positions. Ican also form bends at varying distances from the ends of a rod as inFigures 10, 11 and 13 by using two or more stops 7O, 71, as aboveexplained.

. Although I have above described and prefer to use an index meanscomprising a circular plate having holes in its periphery, other formsmay be used as shown in Figures S and 9. To the vertical sha't't isfixeda plate (Fig. 8) having aligned grooves "7 in its upperand lowersurfaces respectively. A holding plate T8 having a projection T9corresponding to groove 6 is placed on the plate and a complementaryplate having a projection Sl-corresponding to T7 fits into the lowergroove and into plateTS. ,3. fixed, adjusted position. A stop pin, whichmay be of the retracting type is inserted into the end or plate 78.lVhen it is desired to adjustthe angle of bend, screw 82 is loosened,plates 78 and 80 are shifted to the desired position. and clamped inplace-by The form shown in Figure 9 comprises a collar 85 adapted to beadjustably fixed .to the shaft by set screw 86. An arm 81' having astrengthening rib 88 extends radially, "the end of the arm serving as astop pin to en gage projection on the shifting bar. lVhen a plurality ofstops are wanted, additional collars having radial arms are fixed to theshaft.

in Figures 10, 11, 12and 13 I have illustrated a few of thecommon formsinto which rods may be bent by .my machine it being understood that mvmachine is capable of bending almost any shape including closed circles,angles of various sizes and various radii.

to produce various types of bends.

flaring thus fully described my said invention, what I claim as new anddesire to secure by Letters Patent, is:

1. A l iendingmachine comprising awo rk table. a turntable, co-actingmeans on the work table and turntable adapted to bend material uponrotation thereof, a shaft carrying said turntable, said shaft alsocarrying an index plate, means for driving said shaft in oppositedirections comprising a pair of clutches. a pairot clutch levers, alinlcconnecting said clutch levers and having a pro jection thereon, andmeans on the index plate adapted to engage said projection and disengagethe driving clutch.

2. In bending machines a turn table, a work bending means thereoncomprising a central depression, a keyway in the wall sponding in sizeand shape to its extended member.

screw 82 holds "78 and 80 intherev v Pins 50, 55, 56 and 57 show a fewof the shapes which I may use in order f3. In .a bending machine, aturntable, a

stationary table, anabutment carried by the 7 stationary table forengaging objects to be bent' and adjustable either longitudinallyortransverselythereof, a cramping member on the turntable in line withthe abutment, and

a-bending pin spaced? from the cramping i. Ina bendingmachine, aturntable, .a

stationary table, an abutment carried by the second table "for enga; ngobjects to the bent,

a cramping member on the turntable in line with the abutment, a. bendingpin spaced 7 "from the cramping member, and a-gage for rods and thelikecomprising a support ex tending from the stationary tablesubstantially in alignment with the abutment and .thejcramping member,and spaced devices thereon againstwhich the workmay rest;

5, In a bending machine, aturntable', a

stationary table, an abutment carried bythe from the jcramp-ing'memb'er,audagage for i'0ll and; the like comprisinga support ex tending from thestationaryqtable substantially in alignment withthe abutment and the'imping member and devices supportediand adaptedto swing nto and outacting as abutmentsfor theend of'such ob I ject farthest from theoperator.

1 6. In a bending machine, a work table, support ng member bodilyadjustable in a w direction transversely efitslength grooves on the worktable an d having an arm thereon adjustable longitudinally of thesupporting 'membensaid arm carrying a loosely. held roller at'its:t'orward end, a turntable. a crampmember and a. bending pin held xonthe turn table, the bending pin having a kevway' engaging a lrey on theturn table,'a rotary disk on the turntable having a portion cut' awayandbeing adapted to engage a notch in the bendin pin, thus locking itto'the turntable.

t. In a bending machine turh table having spaced devices thereon forengaging an object a) bend the same. a stationary abut 4 meet inalignment with'one o't' said devices at their starting position and aincur ber adapted to ensz'age the end ot a red lying between saiddevices. andfswingahle into and out of such engaging position.

8. in a bending machine, a turntable, a

stationary table, an abutment carried by the secondtable forengagingobjects to be bent, a cramping member on-theturntable in linewith the abutment, a bending pin' spaced from" the cramping member, and2.

ice

gage for rods and the like comprising a support extending from thestationary table substantially in alignment with the abutment and thecramping member, and spaced members pivoted to said support and adaptedselectively to engage the end of the work. 9. In a bending machine, aturn table, a separate bending pin thereon, means inde pendent of thebending pin and rotatably mounted at oneside thereof to lock the samevagainst longitudinal movement, substantially as set forth.

, 10. In a bending machine, a turn table, a separate bending pinthereon, means indepei'ident of the bending pin and rotatably mounted atone side thereof to lock the same against withdrmval from the table andmeans to prevent rotation of the pin relative to the table,substantially as set forth.

11. In a bending machine a turn table having means thereon to engage anobject to be bent, a shaft carrying the table, a worm wheel on theshaft, a worm and its shaft for driving the table, and means fordriving, the table through predetermined angular distances includingclutches and levers for controlling them, a cross-bar connected to thelevers, a parallel cross-bar connected to the first cross-bar and a.plate rotating" with the turntable and carrying adjustable means toengage the latter crossbar and disengage the clutch. 12. in bendingmachines a turn-table, a shaft fixed thereto, means for driving saidshaft, means for cutting off said driving means and a circular indexplate having holes in a face thereof on Sflltl Slittift and means onsaid plate normally inactive but adapted to be'actnated by the operatorwhile the shaft is moving to stop the rotation of said turn-table andshaft at a predetermined point. V i

13. In a bending machine, a turn-table, a stationary table, co-operatingmeans on the tables to engage objects to be bent, a shaft on which theturn-table is lined, means for drivingthe shaft, and means for stoppingthe turntable at a predetermined time comprising a plate attached to theshaft and ha-vlnga plurality of apertures, a pin adapted tobe placed inany one of the apertures, means holding said pin normally 1nactive andmeans co-acting with the pin to stop the machine.

7 14:. In a bending machine, a turn-table', a stationary table,co-operatinp; means on the tables to ene age objects to be bent, a shafton which the turn-table is fixed, means for driving the shaft, and meansfor stopping the turntable at a predetermined time comprising a plateattached to the shaft and having' a plurality of apertures, a pinadapted to be placed in any one of the apertures, another pin adapted tobe inserted in said apertures and normally held in inactive position,and means coacting with either pin to stop the machine.

15. In a bending machine, a turn-table,

reversible driving means therefor, a plate concentric with the table andcarrying a fixed member adapted to engage an element of the drivingmeans to check rotation in one direction uniformly atthe .sanie positionof the table, an adjustable stop for checking rotation in the otherdirection automatically at a predetermined position, a

second adjustable stop normally out of en- "gaging position, and meansadapted to move it into engaging position.

16. In a bending machine, a turn-table, a stationary table, co-operatingmeans on the tables to engage objects to be bent, a shaft on which theturn-table is fixed, means for driving the shaft, and means for stoppingthe turn-table at a predetermined time comprising a plate attached tothe shaft and having a plurality of apertures, a. pin adapted to beplaced in one of the apertures, an-

other pin adapted to be inserted in said apertures and 'normallyheld ininactive position, a treadle whereby the latter pin may 7 be forced intoactivo position, and means co-act1ng w1th. either pln to stop the mas lchine.

17. In a bending machine a turntable hav ing means thereon to engage anobject tobe bent, a shaft carrying the table, a worm wheel on the shaft,a worm audits shaft for driving the table, and means for driving thetable through predetermined angular distances including clutches, across-bar connected to the lever, a parallel crossbar. con- 7 this 29thday of July, A. D. nineteen huni I dred and nineteen.

JULIUS H. HOLMGREEN. [13.8.]

'Witnesses: H. C. BIERMAN,

M. SHULER.

